公开(公告)号：MY128287A

公开(公告)日：2007-01-31

申请号：MYPI20010925

申请日：2001-03-01

Applicant: BASF AG

Inventor： WEIGUNY JENS DR ,  STORCK SEBASTIAN DR RER NAT ,  TENTEN ANDREAS DR ,  RUPPEL WILHELM DR

IPC: C07D307/60 ,  B01J27/28 ,  B01J38/04 ,  C07B61/00 ,  C07C51/215

Abstract: IN A PROCESS FOR PREPARING MALEIC ANHYDRIDE BY HETEROGENEOUSLY CATALYZED GAS-PHASE OXIDATION OF HYDROCARBONS HAVING AT LEAST FOUR CARBON ATOMS USING OXYGEN-CONTAINING GASES IN THE PRESENCE OF A VOLATILE PHOSPHORUS COMPOUND OVER A CATALYST COMPRISING VANADIUM, PHOSPHORUS AND OXYGEN IN A SHELL-AND-TUBE REACTOR UNIT (2) HAVING AT LEAST TWO SUCCESSIVE COOLED REACTION ZONES, THE TEMPERATURE OF THE FIRST REACTION ZONE IS FROM 350 TO 450°C. AND THE TEMPERATURE OF THE SECOND AND FURTHER REACTION ZONES IS FROM 350 TO 480°C. AND THE TEMPERATURE DIFFERENCE BETWEEN THE HOTTEST REACTION ZONE AND THE COOLEST REACTION ZONE IS AT LEAST 2°C.(FIG 1A)